BM2-B-SIM

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Dept. Polymer Engineering

University of Minho

Extrusion BlowExtrusion Blow--Moulding:Moulding:

Influence of ProcessingInfluence of Processing

ConditionsConditions

(using B-SIM software)

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University of Minho

IntroductionIntroduction

B-SIM is a blow-moulding simulation commercial software (provided by

Accuform), that uses Finite Element Analysis.

Main features (more advanced version):

- Extrusion of the parison (with parison programming)

- Stretch blow-moulding from preform

- Viscoelastic model (K-BKZ)

- Temperature dependency

- Imports general 3D models from CAD packages

- Several tools can be used in a single project

- Time dependent parison sagging

- Friction between stretched plastic and plug

- Heat transfer plastic/mould and plastic/air

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University of Minho

IntroductionIntroduction

Main results (more advanced version):

- Final part thickness distribution

- Optimisation of parison/preform thickness

- Analyses of cooling process

- Analyses of part shrinkage

- Calculation of final part weight

- Prediction of printed image deformation for shrink sleeve processes

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University of Minho

Mould geometryMould geometry

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University of Minho

ParisonParison propertiesproperties (reference)

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Process controlProcess control (reference)

MaterialMaterial (reference): polypropylene (PP)

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University of Minho

Inflated partInflated part (reference)

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Dept. Polymer EngineeringUniversity of Minho

Forming sequenceForming sequence (reference)

t=0ms

t

=100ms

t

=250ms

t=2

70ms

t=2

90ms

t=3

00ms

t=320m

s

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Inflated partInflated part (reference)

Thickness

Temperature

Plan

ar

Exte

nsion

L1

/L2

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Thickness distributionThickness distribution (reference)

z = 260 mm

z = 120 mm

z = 240 mm

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Thickness distributionThickness distribution (reference)

z = 150 mm

z = 60 mm

z = 120 mm

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Influence ofInfluence of parisonparison temperature: coolingtemperature: cooling

Tp 165C; Tm 25CTp 155C; Tm 25C

Tp 175C; Tm 25C

20s 40s 60s20s 40s 60s

20s 40s 60s

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Influence of mould temperature:Influence of mould temperature: thickness

0.8

0.9

1.01.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

0 50 100 150 200

Arc length (mm)

Thickness(mm)

25 C

40 C

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Influence ofInfluence of parisonparison thickness:thickness: thickness

0.4

0.9

1.4

1.9

2.4

0 50 100 150 200

Arc length (mm)

Thickness(mm)

2 mm

1 mm

3 mm

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Influence ofInfluence of parisonparison thickness: coolingthickness: cooling

2 mm

20s 40s 60s20s 40s 60s

20s 40s 60s

1 mm

3 mm

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Influence of inflating pressureInfluence of inflating pressure

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

0 50 100 150 200

Arc length (mm)

Thickness(mm)

55 kPa

30 kPa

100 kPa

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Influence of raw material:Influence of raw material: thickness

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

0 50 100 150 200

Arc length (mm)

Thickness(mm)

PP

HDPE

UPVC

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Influence of raw material: coolingInfluence of raw material: cooling

PP

T cooling 20s

HDPE UPVC

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Influence of delay timeInfluence of delay time (before inflation)

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

0 50 100 150 200

Arc length (mm)

Thickness(mm)

250 ms

10 ms

BM2-B-SIM

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